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Although it's nice that authorities can get a better picture using the Health app, there is an issue that arises. The iPhone alone is not the most accurate pedometer. It'll give you some steps and if the barometer is installed, a general idea of stairs "climbed". Hence the defense might challenge the validity of the data in order for it to be accepted for trial.

Authorities might get a basic black and white picture using this data at most.
 
I've increased my step counts just by laying down and waving my arm around with my watch on. My phone says I climbed 7 flights today so far but my watch says only 3.

It's really an inaccurate system for the most part.
 
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